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Abstract

The present study has numerically investigated the lifted flame field frequently encountered in the actual fire situations. This study employs the physical submodels including the detailed chemical kinetics, the variable transport properties, and the radiation model. A lifted laminar CH4/air flame with a central diluted fuel jet and a surrounding fuel-lean coflow is chosen as a validation case. Computations are done for three models which include the detailed chemistry model considering the radiative heat loss, the detailed chemistry model neglecting radiation, and the single-step irreversible chemistry considering radiation. Among three models, the detailed chemistry model considering the radiative heat transfer yields the best conformity with the measured velocity distribution. Numerical results indicate the present approach well captures the detailed structure and stabilization mechanism of the partially premixed triple flame.

Keywords

flame stabilization lifted flame partially premixed mixture detailed chemistry variable transport properties

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References

Chakravarthy, S.R. and Osher, S. (1985). AIAA-85-0363. 23rd Aerospace Sciences Meeting, Reno, NV.

Chase, M. (1986). JANAF Thermodynamic Tables. 3rd Edn. American Chemical Society and American Institute of Physics for the National Bureau of Standards.

Chung, S.H. and Lee, B.J. (1991). On the characteristics of laminar lifted flames in a nonpremixed jet. Combustion and Flame, 86: 62-72.

Djavdan, E. , Darabiha, N. , Giovangigli, V. and Candel, S.M. (1991). Strained propane-air flames with detailed and reduced kinetic schemes. Combust. Sci. and Tech., 76: 287-309.

Domingo, P. and Vervisch, L. (1996). Triple flames and partially premixed combustion in autoignition of non-premixed turbulent mixtures. 26th Symposium (Int.) on Combustion. pp. 233-240.

Joulain, P. (1998). The behavior of pool fires: state of the art and new insights. 27th Symposium (Int.) on Combustion. pp. 2691-2706.

Han, D. and Mungal, M.G. (2000). Observations on the transition from flame liftoff to flame blowout. 28th Symposium (Int.) on Combustion. pp. 537-543.

Kee, R.J. , Warnatz, J. and Miller, J.A. (1983). A FORTRAN computer code package for the evaluation of gas-phase viscosities, conductivities and diffusion coefficients. Sandia Report, SAND83-8209.

Kim, H.J. and Kim, Y.M. (1998). Multidimensional effects on structure and extinction process of counterflow nonpremixed hydrogen-air flames. Combust. Sci. and Tech., 137: 51-80.

10.

Kim, Y.M. , Chen, C.P. , Ziebarth, J.P. and Chen, Y.S. (1994). Prediction of fast transient spray-combustion flows. Numerical Heat Transfer, 25: 21-42.

11.

Kioni, P.N. , Rogg, B. , Bray, K.N.C. and Linan, A. (1993). Flame spread in laminar mixing layers: the triple flame. Combustion and Flame, 95: 276-290.

12.

McCaffrey, B.J. (1984). Combust. Sci. and Tech., 40: 107-136

13.

Miller, F.J. and Ross, H.D. (1998). Smoke visualization of the gas-phase flow during flame spread across a liquid pool. 27th Symposium (Int.) on Combustion. pp. 2715-2722.

14.

Phillips, H. (1965). 10th Symposium (Int.) on Combustion, pp. 1227-1283.

15.

Plessing, T. , Terhoeven, P. , Peters, N. and Mansour, M.S. (1998). An experimental and numerical study on a laminar triple flame. Combustion and Flame, 115: 335-353.

16.

Takahashi, F. , Schmoll, W.J. , Strader, E.A. and Belovich, V.M. (2001). Suppression behavior of obstruction-stabilized pool flames. Combust. Sci. and Tech., 163: 107-130.

17.

Veynante, D. , Vervisch, L. , Linan, A. and Ruetsch, G.R. (1994). Triple flame structure and diffusion flame stabilization. In: Proc. of Summer Prog. Center of Turbulence Research, Stanford University.

18.

Vervisch, L. (2000). Using numerics to help the understanding of non-premixed turbulent flames. 28th Symposium (Int.) on Combustion. pp. 11-24.

Detailed Structure and Stabilization Mechanism of Lifted Laminar Methane Flame

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